Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm54a..01j&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM54A-01
Physics
2455 Particle Precipitation, 2706 Cusp, 2716 Energetic Particles: Precipitating, 7863 Turbulence (4490), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
The open field-line configuration of the cusp allows solar wind particles to precipitate directly into the ionosphere. Precipitating particles exhibit distinctly different characteristics in energy, density, and temperature depending on local time and latitude. Many of these features (energy dispersion and double cusp distributions) can be predicted based on adiabatic guiding center motion of particles. However, adjacent DMSP spectrograms often show significant variation in flux and energy, and precipitating ion spectra are commonly wider in energy than expected from adiabatic mapping of magnetosheath populations. These observations are suggestive that wave-particle interactions in the cusp may provide an important source of energization of precipitating particles. Indeed, the open-field region of the cusp has access to wide-ranging ULF wave sources originating anywhere from the forshock, bow shock, magnetosheath, and magnetopause as well as waves generated by the energetic particle precipation. Wave fluctuations can energize particles as well as provide pitch angle scattering of energetic particles into the loss cone leading to uneven particle precipitation on adjacent field lines. We estimate particle spectra that would be expected from theoretical models of particle energization due to wave turbulence in the cusp region and compare with observations.
Johnson Jay Robert
Wing Simon
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